HR900/HR950/HR1000 Series

The c545 doesn’t have an ESP in it. The guide I followed has you add the ESP. Looks like there are quite a few supported models. Winix C610, AM90, HR1000, C909, T800, 5510, and 9800. https://github.com/iprak/winix https://github.com/mill1000/esphome-winix-c545?tab=readme-ov-file

I agree with the above comments. I am extremely chemically sensitive and my condition started in an office where we brought in a lot of IKEA MDF tables. We returned the tables, but my condition remained. I recommend the IQair Multigas if you want the best home machine for removing formaldehyde and VOCs. It’s expensive though. For basic filtration at a much lower cost, I’d go with Winix. We have the pet one and it’s actually amazing at eliminating smells in the kitty litter room. Replacement filters are also not too expensive. To solve the CO2 issue, you have to exchange indoor air for outdoor air. Purifiers don’t remove CO2 and create fresh Oxygen. Trees do and for trees/plants to work sufficiently indoors hid need them almost wall to wall (there are a lot of myths about like you only need one spider plant etc. but you’d actually need to live in a greenhouse of plants). For CO2 you’ll need to open windows or vent. However, when you use a vent, like a bathroom fan, you’ll likely be pulling replacement air from someplace else in the building, not necessarily a better place with fresher air. A fan blowing in pulling fresh outside air in can get a lot font in a short time. Even ten mins can make a big difference. Go search on YouTube for air purifier info. There is a lot of expertise out there. I learned about the IQair/Winix combo from a researcher in Beijing. Using both makes the IQair filters last longer. Also avoid Levoit. They just got caught lying about being hepa in several of their models. They do have good air purifiers, but some are apparently crap. Last note: because all air purifiers are noisy when they are on high, it’s better to get one that’s for a much larger space and run it at a lower, quieter speed. Consider getting two Winix purifiers or 2 of some other kind with some carbon in the filters. Winix is at Costco.

Just throwing this out there to help with allergies. As you said you have lost your elder dog (rip buddy). Is this new pup the same breed? Just because he was immune to the other dog don’t mean that this one brings new allergies. But it can signify that it’s a different breed that kid can not tolerate. Each breed sheds differently from the other. Some more then the rest. Just a thought. I’m allergic to cats and dogs. But more so cats. We have the homedics 5-1 that really helps. But it’s recently gotten so loud that we are making the switch to the Winix brand. I would recommend staying away from the Lrg round units. Go with a rectangular one.